Average Engineering Business Insurance Cost (2026 Report)

Professional liability insurance for engineering firms averages $137 per month, or $1,644 per year, and covers claims that a design error, faulty calculation or missed specification caused a client financial harm. It is the one policy almost no engineering firm should operate without, whatever its discipline or size. Most commercial and government contracts require design firms to carry $1 million to $2 million in limits, and some large infrastructure projects demand $5 million or more. See how professional liability costs vary by state below.

General liability insurance is the most expensive standard coverage most engineering firms carry, with a solo consultant starting around $40 per month and a firm with one to four employees averaging $168 per month, or $2,016 per year. It covers third-party bodily injury, property damage and legal defense arising from your operations rather than your professional advice. Most commercial leases and client contracts require $1 million per occurrence and $2 million aggregate, and public projects usually want proof before you set foot on site. See how general liability costs vary by state below.

A business owner's policy for engineering firms averages $177 per month, or $2,124 per year, and bundles general liability and commercial property into a single policy at a lower combined price than buying the two separately. It covers third-party injury and property damage claims alongside damage to your own office, workstations, servers and drafting equipment. A BOP generally requires you to occupy standard office space and stay under set property-value and revenue limits, so firms with heavy field equipment may need standalone policies instead. See how BOP costs vary by state below.

Cyber insurance for engineering firms averages $123 per month, or $1,476 per year, covering breach response, client notification, data restoration, ransomware costs and third-party liability when client data is exposed. Engineering practices increasingly hold sensitive project files, client records and building plans, which makes this coverage more relevant than many owners assume. Some government and large commercial contracts now require proof of cyber coverage before granting access to their systems or shared project data. See how cyber insurance costs vary by state below.

Workers' compensation insurance for engineering firms averages $41 per employee per month, or $492 per year, and stays relatively low because engineers spend most of their time in offices rather than on hazardous sites. It covers medical treatment for work injuries, a share of lost wages during recovery and disability benefits, with Indiana averaging $30 per employee per month and California nearly three times higher at $88. Nearly every state mandates coverage once you have employees, and the rules follow the state where the work actually happens rather than where your firm is headquartered. See how workers' comp costs vary by state below.

Commercial property insurance for engineering firms averages just $28 per month, or $336 per year, the lowest and steadiest coverage on this page because most practices run on standard office equipment rather than heavy machinery. It covers damage to your workstations, servers, monitors and tenant improvements from fire, theft, vandalism, water and storms. Landlords commonly require tenants to insure their own contents, and some commercial leases set minimum coverage limits before you move in. See how commercial property costs vary by state below.

Commercial auto insurance for engineering firms averages $115 per month per sedan, or $1,380 per year, and is priced per vehicle rather than per employee. It covers liability for injuries and property damage your driver causes, plus damage to the work vehicle itself from collision, theft, vandalism and weather. Every state requires minimum liability limits on a registered business vehicle, and for a sedan the range runs from $57 per month in Pennsylvania to $219 in Michigan. See how commercial auto costs vary by state below.

Beyond the standard mix, a bookkeeping practice may add specialty coverages that address risks specific to handling client money and data. The table below shows the specialty policies most relevant to the trade, with average monthly costs from external research.